Question: Lubricating greases are a mixture of
[A].

mineral oil, soap and additives.

[B].

mineral oil and metallic soap.

[C].

mineral oil and fatty oil.

[D].

fatty oil and metallic soap.

Answer: Option A

Explanation:

No answer description available for this question.

Question: The biochemical treatment applied to sewage effluents is a process of
[A].

dehydration

[B].

reduction

[C].

oxidation

[D].

polymerisation

Answer: Option C

Explanation:

No answer description available for this question.

Question: Alcohol is produced by the
[A].

oxidation of an aldehyde

[B].

hydrolysis of an ether

[C].

esterification of a fat

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Helium is produced on commercial scale from
[A].

air

[B].

natural gas

[C].

coke oven gas

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dry ice (solidified CO2) is used for the
[A].

storage & shipment of frozen foods and ice-creams.

[B].

liquefaction of permanent gases.

[C].

liquefaction of natural gas.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Enzymes are
[A].

proteins with high molecular weight (around 10, 000).

[B].

derived from living organisms.

[C].

catalyst for temperature sensitive reactions.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is
[A].

a slow reaction.

[B].

a discontinuous reaction (requiring regeneration of iron by water gas intermittently).

[C].

still in development stage (by employing fluidised bed technique).

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Pasteurisation of milk means
[A].

removal of fatty and albuminous substance from it.

[B].

killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.

[C].

inhibiting the growth of micro-organisms without killing them.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.
[A].

7-14 and 14-30

[B].

7-14 and 40-50

[C].

14 – 30 and 40-50

[D].

10 – 20 and 40 – 50

Answer: Option A

Explanation:

No answer description available for this question.